Valve for irrigation siphon conduits



P 1954 DE ROY SIMPSON VALVE FOR IRRIGATION ,SIPHON CONDUITS Filed Sept.26, 1950 INKENTOR. De Roy S/mpson Patented Sept. 7, 1954 UNITED STATESPATENT OFFICE 2,688,461

I VALVE FOR IRRIGATION SIPHON CONDUITS De Roy Simpson, Tulelake, Calif.

Application September 26, 1950, Serial No. 186,774

1 Claim. 1

This invention relates to improvements in valves for irrigating siphonconduits and has particular reference to a siphon for use in irrigationwork.

The principal object of this invention is to provide a portable siphonvalve which is light in construction and therefore one which may bereadily moved from place to place.

A further object is to provide a valve arrangeinent which will tightlyseal the end of the siphon through a straight-line pull, thus preventingdamage to the sealing pad.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

Fig. 1 is a side elevation of my siphon as the same would appear in aditch and having a portion thereof broken away;

Fig. 2 is a similar view, showing the valve in open position;

Fig. 3 is a cross sectional view taken on line 33 of Fig. l;

Fig.4 'isa cross sectional view taken on line 4-4 of Fig. 1;

Fig. 5 is a fragmentary bottom end view of the intake end of the siphon;

Fig. 6 is a top plane view of the discharge end of the siphon; and

Fig. 7 is an enlarged side elevation of the discharge valve, showing thesame in wide-open position.

In irrigating fields, there is provided a supply ditch and in order tofeed water therefrom to side ditches, it has been customary to useoutlet boxes installed between the supply ditch and the laterals. Theseare expensive, interfere with the cultivating of the fields, andoftentimes Wash out through leakage around the sides thereof.

The ordinary siphon as now used causes a digging action at the dischargeend, particularly when the head in the supply ditch is high, or there isno water in the lateral.

With my siphon I have overcome these difiiculties, as will be laterseen.

In the accompanying drawings, wherein for the purpose of illustration isshown a preferred embodiment of my invention, the numeral 5 designatesthe supply ditch, and the numeral 6 the lateral.

My siphon consists of a horizontal section I and downwardly diverginglegs 8 and 9, the leg 8 being the intake leg and the leg 9 being theoutlet leg.

The cross section of the legs and horizontal section is best shown inFig. 4.

Referring to Figs. 1, 2 and 5, it will be noted that the bottom of theintake leg 8 is cut on a horizontal plane and is provided with asupporting foot II which rests upon the bottom of i the ditch 5. Thishorizontally arranged opening gives a large intake area, as shown inFig. 5, which is much greater than the cross section diameter of theleg, as shown in Fig. 4, the result being that when water is flowingthrough the siphon, the intake over the enlarged area is not sufficientto cause eddy currents and to thus suck down from the top air vortexeswhich would destroy the vacuum and consequently the fiow water throughthe siphon.

Referring now to Figs. 6 and 7, it will be noted that the leg 9 has apair of upstanding brackets I2, positioned on opposite sides thereof,and serving to pivot to the bottom ends thereof a pan-like valve l3,which has an upturned end I4, the purpose of which will be later seen.

The pivot pin I6 is positioned in a slot I'I formed in the ends of thebrackets l2. In order to open and close the pivoted valve I3, I providea handle I8, a portion of which forms a cross bar pivoted to the upperend of the brackets I2, both ends of the cross-bar portions of thehandle being bent at right angles, each bent portion being furtherprovided with an offset crank portion parallel with the axis of the pinsl6 to which the eye of one of the adjustable turnbuckles I9 are secured.The opposite ends of these turnbuckles are in turn pivoted as at 2| tosubstantially the center portion of the valve I3, thus creating anover-reenter action as the pivotal connections at the opposite ends ofthe turnbuckle and the pivotal connection of the lever with the conduitare so arranged that in the valve-closed position an over-centercondition exists, thereby locking the valve in the closed position. Thisvalve carries a gasket arranged so as to engage the discharge end of thepipe leg 9, which effects a seal against the end of the pipe leg whenthe toggle action takes place.

Positioned in the top of the horizontal section I is a dome 23, to whicha detachable pump 24 may be attached.

The result of this construction is that when the siphon is positioned ina supply ditch with its discharge end positioned in a lateral ditch, theuser attaches the pump 24 to the dome 23, and with the valve I3 inclosed position as shown in Fig. 1, starts to extract air from thesiphon with the result that water will be sucked into the siphon untilthe siphon is completely filled with water. By now grasping the handle[8 and moving it in the direction of the arrow in Fig. 2, the valve Mwill be moved away from the discharge end of the siphon, and water willimmediately start to flow through the siphon from the higher level inthe supply ditch to the lower level in the lateral.

This water will engage the valve surface now in the position of Fig. 2and will flow easily therefrom, without causing any digging as wouldoccur should the water discharge directly on to the ground. After thelateral has been sufficiently killed so that the bottom of the dischargeend is covered, then the valve may be swung to entirely open position,as shown in Fig. 7, if desired.

In closing the valve, it will be apparent that the slip joint betweenthe pivot I6 and the slots II will permit the gasket to form a flat sealagainst the end of the pipe, and the straightline pull will effect aproper sealing.

It will also be noted that the pivot points A, B and C are out ofalignment with each other when the valve is in closed position, shown inFig. 1, and therefore over center action will pre vent accidentlyopening of the valve.

The same is true when the valve is in full open position, and thereforethe end [4 of the valve may be used to support the end of the leg ifdesired, as the same will not close until the lever [B is manuallyactuated.

' From the above it will noted that I have accomplished all of theobjects set forth.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claim.

Having thus described my invention, I claim:

A valve for irrigation conduits comprising a pair of vertical spacedbrackets secured on opposite sides of the discharge end of the conduit,a pan-shaped valve having a slidable pivotal connection with the lowerends of said spaced brackets, said pivotal connections including slotsformed in the lower ends of said brackets, said slots engaging pinssecured to said pan, the slots being perpendicular to the seatingsurface of said valve when in closed position, said valve having anupturned end remote from its pivotal connections, means for moving saidvalve toward or away from the end of said conduit and comprising a leverpivotally mounted on said conduit and having offset cranks formedtherein and parallel with the pivot pins of said valve, and a turnbucklepivotally carried by each of said offset cranks and having theiropposite ends pivotally connected to opposite sides of said valveintermediate said upturned end and said sliding pivotal connection, andthe pivotal connections at the opposite ends of the turnbuckle and thepivotal connection of the lever with the conduit being so arranged thatin the closed valve position an over-center condition exists, therebylocking said valve in closed position.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 478,472 Schroeder July 5, 1892 746,326 Hain Dec. 8, 1903837,526 Wikgren Dec. 4, 1906 886,390 Moninghofl' May 5, 1908 913,121Frayer Feb. 23, 1909 962,624 Cook June .28, 1910 1,059,116 Chapin Apr.15, 1913 1,241,916 Brown Oct. 2, 1917 1,584,550 Kellogg May 11, 19261,612,463 Myers Dec. 28, 1926 1,674,201 Goodier June 19, 1928 2,068,363Wetmore et al Jan. 19, 1937 2,272,655 Briese Feb. 10, 1942 2,393,867Nicholson Jan. 29, 1946 2,589,540 Couchot Mar. 18, 1952 FOREIGN PATENTSNumber Country Date 421,532 Germany Nov. 13, 1925 40,384 France Mar. 15,1932 (Addition to No. 701,049.)

